1410-ZZ4 The Luca Aul Model #1410 Portable Indicator indicates voltage, frequency, and polarity. Indicates presence of voltage between 25 and 600 volts, whether the current is AC or DC, the polarity of the DC or the frequency ( 60 or 400 Hz ) of the line and the nominal voltage. 2x2.9x5.5, 2 lbs sh. (L2J) Unused,